Cloth-cutting machine.



APPLICATION FILED DEC. 81, 1913.

1,103,791. Patented July 14,1914L v 2 SHEETSSHEET l.

M. R. MAIMIN.

CLOTH CUTTING MACHINE.

IIVVEA/TOR M. R. MAIMIN.

CLOTH CUTTING MACHINE.

. APPLICATION FILED DEC. 31, 1913.

1, 1 @339 1. Patented July 14, 1914.

2 SHEETS-SHEET 2.

WITNESSES:

PATENT FFICE.

MAYER R. MAIMIN, OF NEW YORK, N. Y., ASSIGNOR TO H. MAHWIIN' COMPANY,

IN GORPORATED, OF NEW YORK, N.

Y., A CORPORATION OF NEW YORK.

CLOTH-CUTTING MACHINE. L

Specification of Letters Patent.

Patented July 114i, 191%.

To all whom it may concern:

Be it known that I, MAYER R. MA MIN, a citizen of the United States, residing in the city of New York, State of New York, have invented certain new and useful Improvei chines, the grinding device consists of a pair ments' in Cloth-Cutting Machines, of which the followin is. afull, clear, and exact description, re erence being had to the accompanying drawings, forming a part of this specification; a

My invention relates to cloth cutting machines of that type comprising a carriage including a supporting base plate, adapted to be propelled manually, and whereon .is mounted a motor or other source ofpower a power-driven circular or disk-shaped blade, and a blade-sharpening device so mounted that it may be moved into and out of operative' position relatively to-the circular blade. In the operation of such a machine several layers of cloth are cut simultaneously, the top layer being usually marked with a chalk line to decide the direction and line of the cutting to be done. In so doing the common practice is for the operator to push the carriage toward the work to be cut, by employing one of his hands, actin on the grasping handle of the machine, while his other hand is employed in holding the layers of cloth in proper position to be cut; in consequence the line of cutting is frequently irregular and contact of the workmans hand with the rapidly rotating blade frequently results from.

' accident or inadvertence.

The object of my invention is to remedy both of these defects; and my improvements in a machine of the type stated consist. of

elements in combination therewith adapted to efi'ect the two objects'stated, as hereinafter described. I

The circular-blade cloth-cutting machine illustrated in the drawings, in so far as it consists of the combined movable base plate and carriage, with the superposed motor and propelling handle, the revoluble circular blade, the sharpening device and means to mount it on the carriage in such manner that it may be brought into operativeand inoperative positions relatively to the blade, is of a type long well known in the art. It has also been well known to apply to such machines, various means constitutin a protecting guard to prevent accidentaf contact of the operators hand with the blade; and it is obvious that such means must be normally in front of the knife edge and also capable of j being moved from that position in order to enable the sharpening device to be brought into like position when it is desired to grind the edge of-the blade. In such known maof emery or corundum disks mounted in spaced relation, revolubly, on a'shaft having the carriage frame above the plane of the blade and adapted to swing the sharpening disks upward and out of the plane of movement of the blade, this being their normal position wherein their carrying arm is resiliently held by a coiled spring. To sharpen swung downward so that the inclined edges of the rapidly rotating blade enter between the separated emery disks, and the latter bei-ng freely rotatable on their common bearing one of them grinds one inclined side of the blade in one direction while the other grinds the opposite inclined side of theblade inthe reverse direction.

In my novel structural and combined cluding the, pivoted and swinging bracket on which both are mounted, the characteristic features comprise a guard bar which is brought automatically into operative position by the same movement of the ivoted arm which throws the grinding device into inoperative position and vice versa, said movable bracket being so mounted as to have @an arc-like movement in front of and in falinement with the plane of rotation of the {cutting blade, said movement being man- Zually efi'ected through the operating lever fwhich forms an elemental adjunct of said "ing links or other interposed actuating means, and the heel of the lever drops automatically into locked position at the tervmin'us of the upward throw of the bracket,

v perpendicular and operative position in front of and adjacent to the blade edge, as Well asiat the same time supporting the ,grinding device in raised and inoperative Eposition. As the guard bar is adjustable fivertically in its bearings, the magnifying lens which is rotatably movable can-pe adjusted in both directions relatively o the work, accordingly.

swinging bracket, and without any connect-- thereby holding the guard bar fixedly in In the accompanying drawings, illus-- its bearings in a bracket which is pivoted on the, blade the pivoted bracket is. manually grinding device and guard for the blade, in-

trating myinvention: Figure 1 is a side elevation, partly broken away, of a cloth cutting machine embodying my invention, showing the sharpening device in the inoperative position. and the blade guard in the operative position. Fig.,2 is a side elevation, showing the sharpening device in the operative position and the blade guard in the inoperative position. Fig. 3 is a front elevation, with the parts in the position shown in Fig.1. Fig. 4 is a plan, partly in section and partly broken away, showing the parts in the position shown in Fig. 1.

Referring to the drawings, the carriage or frame of the machine comprises, as generally stated, a low base portion orpla-te 2, a narrow standard 3 rising from the base plate 2 and a motor case 4 supported on thetop of the standard 3. A suitable handle 5 is provided which projects rearwardly from the carriage, and by means of which the carriage may be moved by hand over the top of the table supporting the cloth to be cut. The base plate is provided with suitably located anti-friction rollers 6 Which are journaled therein in a manner to support the carriage and facilitate its move ment over the table.

The standard 3 is provided with a short stud shaft 7 on .which is rotatably-mounted a sleeve 8 carrying a circular knife or cutter 9. The sleeve 8 has a clamping collar 10 screwed thereon to hold the knife 9 in place and topermit its removal from the sleeve 8. The sleeve 8 and knife 9 thereon are adapted to be rotated in the usual manner by mechanism, not shown, actuated by a motor contained within the case 4. The lower portion of the knife '9 extends into a 'slot in the base plate 2 and into a. slot in a raised portion of the plate or ablock 11 at the lower forward portion of the cutting edge of the blade 9. The block supports that portion of the cloth which is being acted upon b the blade 9 during the cutting operation, t e base plate 2 and block 11 moving beneath the cloth and over the .top of the table supporting the same in the usual well known manner, during the operation of the machine. The blade 9 and standard 3 are, as usual, made very narrow so that they may readily enter the cut made in the cloth by the blade.

The upper portion of the standard 3 is provided with a forwardly extending arm 12 adjacent to one side of the blade 9. The forward" end of the arm 12 carries a pivot stud 13 on which is pivoted a bracket 14, which is so mounted in its bearing as to 6.0 permit of an are like reciprocation of it in front of and in alinement with the plane of rotation of the cutting blade. The bracket '14 embraces a pair of emery or corundum' sharpening wheels or disks 15 for the blade 9. Each disk 15 is mounted on a shaft 16 which is rotatably mounted in a bearing on the bracket 14, and the disks 15 are spaced a slight distan'ceapart to permit the cutting edge of the blade 9 to enter therebetween. The inner faces of the disks 15 are beveled,

as shown, and the shafts 16 are so arranged 'of the disks 15' will be out of parallel relation to the axis of rotation of the blade 9,

the beveled face of one disk 15 will be in contact with and rotated by one inclined side of the blade 9 and the beveled face of the other disk 15 will be in contact with and rotated by the other inclined side of -the blade. When the bracket 14 is moved to the position shown in Fig. 2, and the pressure of the hand of the workman presses the disks 15 against the blade 9, the disks will grind and sharpen the cutting edge of the blade in the usual manner.

The upper and rearward cutting edge of v the blade 9, above the base plate 2 is guarded by a. flange 17 formed on the standard 3. It is, however, necessary that the forward cutting edge of the blade have no permanent guard a jacent thereto, as the space adjacent this portion of the blade must be clear to receive the sharpeningdevice when it is moved into the operative position. I therefore provide a guard which is carried by and movable with the bracket 14. This guard comprisesa bar 18, preferably straight, as shown, extending through an openmg in the bracket 14 and being longitudinally adjustable therein. guard 18 is engaged bya set screw 19 in the bracket 14 and the set screw is adapted to secure the bar 18 to the bracket in different positions of adjustment.

The bar or When the bracket 14 is in the raised position, shown in Fig. 1, the bar or guard 18 is in substantially a vertical posit-ion in ad- Fig. 1 to the position shown in Fig. 2, the

guard 18is moved, from its operative-position shown in Fig. 1 to its inoperative.

position shown in Fig. 2, and the sharpening disks 15 are moved from their inoperative position shown in Fig. 1 to their operative position shown in Fig. 2. Consequently,

when the sharpening disks 15 are returned to their normal or inoperative position, the

bracket.

the arm 23, instantly releases the latch 20 guard 18 will, at the same time and by the same operation, bereturned to its operative or normal posit-ion.

To hold the bracket 14 firmly in its normal position, shown in Fig. 1, I provide the bracket with a latch 20 pivoted thereto, at 21 and having a notched end adapted to engage an upwardly extending projection 22 on a plate or bracket 23 secured to the bottom of the motor case 4. The latch 20 has an arm or thumb piece 23 which projects over' the outer portion of one side of the bracket 14, as shown, and has interposed between it and the bracket 14 a spring 24 which forces the latch 20 into engagement with the projection 22. When it is desired to lower the bracket 14 to grind or sharpen the blade 9, it is merely necessary for the workman to grasp the bracket 14 with his thumb upon the arm 23 and lower the The pressure of the thumb upon from the projection 22 and permits the loweringof the bracket. The latch 20 and projection 22 are suitably beveled so that the latch 20 will ride over the projection 22 and reengage itself therewith when the bracket 14 is raised.

The pivot stud 13 has a spring30 surrounding the same which is arranged and connected to the stud 13 and bracket 14 in a manner to raise the bracket 14 from the position shown in Fig. 2 to the normal position shown in Fi 1 when the bracket is released. This raising of the bracket 14 by the spring 30 will, of course, cause the latch 20 to automatically rengage itself with the projection 22.

In order to locate the bar or guard 18 as near as possible to the forward cuttingedge of the blade 9 when the guard is in the operative position and yet permit the bar 18 to clear the clamping collar 8 of the blade 9- when the lower portion of the guard 18 is raised to the inoperative position, I

arrange the pivot stud 13 of the bracket 14 on an angle with respect to the axis'of rotation of the blade 9, as clearly shown in Fig. 4. The angle of the stud 13 is such that the lower portion of the guard 18 will swin outwardly from the blade 9 as the guar moves to the inoperative osition.

The main body of the ar or guard 18 is made flat with its broad faces substantially parallel to the plane of the side face of the cutter so as to obstruct the workmans view of the cutt-in line marked on the cloth, as little as possi le; and in order to enable the Workman to clearly see this cutting line, which is sometimes indistin'ctly marked and irregular, I provide a magnifying glass 25 so located as to permit the workman to readily see the cutting line through the lass as the line approaches the blade 9 (Turing the cutting operation.

The glass 25 is mounted in a frame 26 having a collar 27 formed thereon which surrounds the round offset lower end of the guard 18 and is secured thereto by means of a suitable set screw 28. By loosening the set screw 28- the collar 27 and glass 25 may be adjusted, within limits, circularly about the axis of the offset lower end of the guard ,18; and by loosening the set screw 19 and raising and lowering the guard 18, the glass 525 may be adjusted vertically. It will be lobserved that the glass 25 and its support- ?ing parts are located to clear the blade 9 gand its clamping collar 10 when the guard 18 is moved to the inoperative position, and that the movement of the guard 18 into and out of its operative position will also move jthe glass 25 into and out of its operative position.

Having thus described my invention, I claim. 1

1'. In a cloth cutting machine the combination with a carriage, a circular blade rotatably mounted thereon, a bracket pivotally mounted on the carriage to have a swing ing movement in a vertical are; a grinding device and a guard device, for the blade, both mounted on said pivoted bracket, and a lever including a latch device adapted to actuate said pivoted bracket on its downward movement, and automatically lock it at the terminus of its upward movement.

2. In a cloth cutting machine comprising a movable carriage, a rotatable circular blade, a bracket pivoted on the carriage to have a swinging movement in a vertical are, a grinding device, and a guard device, bot-h mounted on said bracket in such relation to each other that the grinding device will be out of operative position when the guard is in operative posltion, and a latch adapted to automatically lock said elements in said positions.

3. In. a cloth cutting machine comprising a movable carriage, a circular blade mounted rotatably thereon, a bracket pivotally mounted on the carriage to have a vertical swinging movement in an arc in front of the blade, means operating as a lever to depress said bracket and as a latch to automatically lock it in raised position, resilient means operating to raise said bracket into position to be looked, a grinding device and a guard bar, both directly mounted on' said swinging bracket, whereby the guard bar is brought into and held in operative perpendicular position when the grinding device is raised into inoperative position.

4. In a cloth cutting machine comprising a movable carriage and a circular blade mounted thereon to be revoluble in a. vertical plane, the combination therewith of a single movable bracket pivotally mounted on the carriage in such manner as to permit its arc-like reciprocation in front of and in alinement with the plane of rotation of the revoluble cutting blade; a guard device, and a grinding device, both directly mounted on said bracket and actuated thereby in such relation to each other that the guard device will be in operative position when the grinding device is out of operative position and vice versa, with, devices adapted to impart the specified operative movement to said bracket, substantially as set forth.

5. In a cloth cutting machine the combination with a carriage, a circular blade mounted rotatably thereon,a bracket pivotally mounted on the carriage and adapted to have a swinging movement in a vertical arc, the axis of the pivot being disposed at an angle to the axis of rotation of the blade, a straight guard bar mounted directly on said bracket in such manner as to assume a perpendicular position in front of the blade when the pivoted bracket is depressed, and to assume a position across the face of the blade when the pivoted bracket is raised; resilient means to automatically retract the bracket when manually released' from its lowered position, and means to automatically engage and lock it when it reaches the terminus of its upward position.

6. In a cloth cutting machine comprlslng in combination a movable carriage and a slot of said bracket and in such relation thereto that it can only be brought into operative perpendicularity at the terminus of the upward swing of said bracket.

7. In a cloth cuttingmachine in combination with the movable carriage, a blade revoluble in a vertical plane, a bracket piv-' oted on the carriage and having a swinging movement in a vertical arc in a direction in front of the blade edge of a straight guard bar mounted on said bracket in such relation thereto as to be perpendicular in normal and operative position, said bar having its lower end constructed to support a transversely disposed magnifying lens and provide a bearin therefor adapted to permit of its rotatabl the blade edge.

In testimony whereof I have hereunto aflixed my signature this 19 day of December A. D. 1913.

MAYER R. MAIMIN.

Witnesses:

THEODORE I. STUR'rz, D. S. MAIMIN.

e adjustment relatively to 1 

